Delta Air Lines has issued a detailed memo to both current and aspiring flight attendants outlining strict wardrobe and grooming guidelines.

The two-page document mandates the wearing of proper undergarments that remain invisible, emphasizes a professional and neat appearance, and includes specific rules on hair, jewelry, and clothing.

Highlights include naturally colored hair, subtle nail designs, and covered tattoos without bandages as solutions.

Dresses and skirts must be at or below knee length, and flight attendants must wear closed-toe flats, heels, or sling-back shoes.

Interviews are subject to a no-tolerance policy for profanity, gum chewing, and phone or earbud usage.

Delta ensures accommodations for religious beliefs unless they cause safety hazards or undue burden.